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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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45#钢高速冲击穿孔的显微组织
Keywords: 高速冲击,45#钢,显微组织结构
Abstract:
？借助烧结的w合金圆柱体垂直冲击60mm厚的45#热轧钢板实验，利用扫描电镜和光学金相显微镜研究了45#钢高速冲击穿孔的显微组织。冲击波使穿孔周围的晶粒破碎，冲击引起的材料变形功转变为热能，以及侵彻过程中的摩擦作用，使穿孔表面熔化，靠近熔化区的晶粒发生再结晶.从穿孔表面到钢板内部的部分可分为：熔化快凝层、再结晶细晶层、变形细晶层、形变层和正常基体组织。在细晶层和形变层中，铁素体晶粒的变形量要远远大于珠光体，部分珠光体开裂，其周围形成微裂纹或微孔洞。钢中的硫化锰夹杂在变形中被剧烈拉长。由于铁素体良好的塑性，钢板的破坏方式为延性扩孔。
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